參數(shù)資料
型號(hào)： TLE6711G
廠商： INFINEON TECHNOLOGIES AG
英文描述： Multifunctional Voltage Regulator and Watchdog
中文描述： 多功能穩(wěn)壓器和看門(mén)狗
文件頁(yè)數(shù)： 19/28頁(yè)
文件大?。?/td> 265K
代理商： TLE6711G
Data Sheet V 2.22
19
2001-04-23
TLE 6711
Circuit Description
2.3.1
For supervision of the Boost output voltage an open drain DMOS output is used. The
output is high impedance in normal operation and low during the warning.
The OVL goes LOW if the PWM comparator output (see Boost Converter Block
Diagram) remains HIGH for clock time period. This occurs when the Error-Signal falls
below the minimum value of the Error-Ramp, this mean that Boost voltage falls below a
certain threshold voltage.
The OVL output used as a warning for insufficient Boost voltage.
Boost Status Output OVL
2.4
Buck Converter
A stabili
z
ed logic supply voltage (typ. 5 V) for general purpose is reali
z
ed in the system
by a buck converter. An external buck-inductance
L
BU
is PWM switched by a high side
DMOS power transistor with the programmed frequency (pin R).
The buck regulator supply is given by the boost converter output
V
BOOST
, in case of a
battery power-down the stored energy of the boost converter capacitor is used.
Like the boost converter, the buck converter uses the temperature compensated
bandgap reference voltage (typ. 2.8 V) for its regulation loop.
This reference voltage is connected to the non-inverting input of the error amplifier and
an internal voltage divider supplies the inverting input. Therefore the output voltage
V
CC
is fixed due to the internal resistor ratio to typ. 5.0 V.
The output of the error amplifier goes to the inverting input of the PWM comparator as
well as to the buck compensation output BUC.
When the error amplifier output voltage exceeds the sawtooth voltage the output power
MOS-transistor is switched on. So the duration of the output transistor conduction phase
depends on the
V
CC
level. A logic signal PWM with variable pulse width is generated.
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